| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 0 | 9 | 0.000 | (0,0) | 0.000 | --bye-- |
| 1 | 7 | 0.500 | (1,0) | -0.500 | Montana St | 59 to 13 | 518 | 68 |
| 2 | 663 | -1.985 | (2,0) | -2.985 | Oklahoma St | 69 to 3 | 690 | 160 |
| 3 | 39 | 1.727 | (3,0) | 0.727 | Northwestern | 34 to 14 | 115 | 55 |
| 4 | 40 | 1.674 | (4,0) | 0.674 | Oregon St | 41 to 7 | 228 | 134 |
| 5 | 20 | 2.130 | (5,0) | 1.130 | Penn St | 30 to 24 | 52 | 98 |
| 6 | 15 | 2.127 | (5,0) | 1.127 | --bye-- |
| 7 | 24 | 2.089 | (5,1) | 1.423 | Indiana | 20 to 30 | 4 | 2 |
| 8 | 18 | 2.091 | (6,1) | 1.377 | Rutgers | 56 to 10 | 114 | 91 |
| 9 | 16 | 2.144 | (7,1) | 1.394 | Wisconsin | 21 to 7 | 97 | 96 |
| 10 | 13 | 2.161 | (7,1) | 1.411 | --bye-- |
| 11 | | | | | Iowa | | | 45 |
| 12 | | | | | Minnesota | | | 50 |
| 13 | | | | | USC | | | 18 |
| 14 | | | | | Washington | | | 16 |
| 15 | | | | | --bye-- |
| 16 | | | | | --bye-- |
| 17 | | | | | --bye-- |
| 18 | | | | | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |